“Concealed carry” exists for a number of reasons. When you’re doing it, you want to be living up to both parts of the phrase: you want to be carrying, and have access to, a firearm, and you want it to be discreetly hidden until such time as you need it.
For some men, any jacket long enough to hide a holster is sufficient. But for most men, concealed carry needs to fit other societal expectations.
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Hat Tip PON.